Cut-off gate-valve.



F. P. SNOW.

CUT-OFF GATE VALVE.

APPLICATION FILED 00]. I8, 1916.

Patented Apr. 8, 1919.

' Inveniror.

Tran Z? dnoux W5 V fr m their :SfltlBSzSQiirSytO 11105 11 p f s en-aminespssgimo ma' V se i? GMs-"vnvs To all whom it may concern B t kn wn "ihaD L- FR ANK 1?. SNOW, a citizen of the United Statesiesidinghat Angeles, in the foo-1 1i of 1108 Angeles and State of ECali-fOrnia, ave invented certain new and useful Improvements in GnpOff' which. the fiollovvin'g is; a

samevvhen thevzalwe-iswt begepened It" is a further Te jsa' Qf than iention ltd provide a 'out ofi valve Yvvith; a val-ve -disk and seating membe ge single valvee stem' being-employedforseating or unseatingand adjnsting'theydisk. I I; Q 1131s sis-111 fu ft eiti ie t of theris vention ftolprovideea cu valve disks having seating Wed em -beni-hetvven them; and a va ve- 5 it QPe gthe parts," i r -:With-.these land ohher fgnv-entiem comprises fcer tain nove c nstrnc t1ons,; "combinations and arrangements 'parts,;as ;w1:l1 136 hereina fitefiilly descri bed and claimed. v

I In the accernpanyingdrawin fioliniingi a part-of this speclficatienz 3 l :5 5 t Figure 1, vent eal .iQQQt LSBQ QHQ viewtaken through ,a cute-"off gatevalveleonstrncted in accordance. with the presentlinvention.

view taken in a plane. between the disks aojf the valve ehtmngh '.-the lower portion ofthe valve casing, the valve stem and spreading member be ng shown ins de elevation.

Fig. is a detail seetional view: takennpontheline8 3of Fig g-f V T gatealv ei h i l n -i ventien d isnedto' supp y emed s mple and yetpraet-i-cal .entsefl? moderate pressures and 7 ab e iio au dn steel, inon or other Specification tr Letterislatent.

e- .v a

se mug-or coupling-flanges 1 4i and dis fiiligat tv lve'wi h- 15 9:

5 also provide sea s radantedd efi l p p ines and; s i s m t n anhtnnmni swp entgene el 7 "Fantasia-V. S, 1919'.-

'2 4Pp1icati9n4neaoetobsr 18,4915. swat-1.116;126,288;

suitable tor useivvithlicementv piping findpipelines such. as:are commonly ',jemployedv "111* lrrig-ating and other Wateij, distribution systems. n 1 7 1 thezaceompanying drawing a preferred $011111 Of the device has been illustrated and u the details and features of the invention will nowhe more specifically Ide seribed, reference bGlnghadt-lriereto'. In the said drawings?) "indieates the principal casing .of the valve having an upper section X5 mounted thereon.

langes 7 and .8 upon the two sections are vfapplied together andysecni'ed bybolts -19 or other 'snitable holdingmeans, In the opposite {sides of thecasing 5Q openingszor. ports 7 LO iaiid .11 ane provided for the passage of materials-that are to be-controlled hy the gate; gut-roundingsaidports and upon the inner surfaces oi the walls ,of the, casing; #5

are valve: seats -12 and 13.? 2 Outside thelsaid 5110, 2 "pi'efenably 'of-fl ger dime Lind gdesi i'ablei es 116 and 17 having? thi the s 1 ead eri}20-}and lift; th

may-, bereetangnlar "on manyv sided; in

ally ade cylindrical, an d hollow as cleja1 l' 1 3 1613 b5 7 121 19 1 valve jldisksi a fe, raised, The saids reader I05 sectional s11ape,-butfoi' eonvenienceis-usnshownwil'i- Figvl ofthewclravving.. lllhezlower" v end ,ofytheaspreader 20 isenlarged $01212, its v l enter suriace being rounded ato approxi Fig. is a fragmentary-detail se'ctional net lysfit With the esses 1 -01? he va ve disks 11:6 and 17 The lsaidenlargedportion 22 act'sv as a wedge for forcing-the valve f disks gap art and. holding them tightly against the seats'lQ and 13. Thenpper endjof the Spreader is pfovlided; Withjan apei tniefi which loosely fits upon" the valve :stemf2l,

engageinen t o-if .the valvestein; Jtlie apertu ed "end ef the said spreader is s 'lfi:

s I "e d-f the sw ete '41 by means of a nut 26, limits the downward movement of the said spreader, and operates to hold the spreader when the valve disks are lowered so that the said valve disks are spread and carried to their seats, upon coming opposite the ports 10 and 11.

The valve disks 16 and 17 have upwardly extending projections 27 which are perforated to form bearings for engaging trunnions 28 which project oppositely from a ring nut 29, the said ring nut with its trunnions forming a movable yoke member for raising'and lowering the valve disks. The said ring nut 29 is internally threaded so as to engage and be moved by the threaded portion 30 of the valve stem 24. The said valve stem passes through the upper end of the casing section 6 and through a packing gland 31 secured upon the top of said casing section 6. The valve stem 24: is pro vided with a collar or annular projection 32 which fits in a recess 38 at the base of the packing gland, the said annular projection 32 operating to prevent any longitudinal .movement' in the V valve stem 24:. The upper portion of the valve stem 24 is made" smooth so as to turn easily in thepacking gland and if desired the smooth portion may be inclosed by a thin sleeve or sheathing of brass or' other non-rusting material 3 1 so; that the easy: operation of the-"valve will not. be interfered with bylrust; For

the same reason brass or other jnon-eorroding washers 35' and 36 may be applied against the upper and lower-faces of the annularprojectionj32 for' taking the end thrust of the valve 'stem'without rust and LQu-ndue frictionp A hand wheel"37 maybe secured tothe upper end of the valve stem,

or any other hand engaging means applied "thereto for turningthevalvejstem and operating'the valve mechanism.

Iti'Will' be observed that the "ring nut 29.

: spacesthe upperportions of the valve disks solthat theirmovement away fromthe valve seats is" not great, though being amply suffioient to" completely disengage the said disks from said seats. The lower portions ofsaid'idisks are also similarly spaced with respect to each other by means of bosses or studs 38 and 39 which project from the inner surfaces of the valve disks. Projec- 'tions 4:0.0n the end of one of said studs also extend into recesses 41 on the opposlng studs, engaginglthe same sufficiently loosely to permit a sufiicient leeway for the seating and unseatingof the valves and the raising and the lowering of the same without ungdue friction.

In the operation of the device, the valve disks being seated as shown in Fig. 1 and V held in. spread positions against the valve seats, in order toopen the: valve, it is; only 'necessary'to turnthe hand wheel 37 The rotation of the threaded portion 30 of the valve stem will carry the ring nut 29 upwardly and the valve disks 16 and 17 will be raised first, freeing them from the spreadingportion 22 of the spreading member 20 and allowing them to become loose upon the valve seats. A continued movement of the ring nut 29 will lift the disks until the lugs 21 engage the lower end of the spreader 20. The spreader will be then lifted by the disks and slide along the valve stem until the disks have been carried to any desired height in the valve casing to permit of the desired flow of materials past the gate. The operation of closing the gate is of course merely a reversal of the movements described. The turning of the valve stem the other way operates to carry the ring nut 29 downwardly upon the threaded portions of said stem whereby the valve disks are lowered, the spreader descending with them until it rests upon the washer 25. The washer 25 arrests its downward movement but the ring nut 29 will move the disks downwardly until they are spread by the enlarged portion 22 of the spreader and are thus forced tightly against the valve seats 12 and 13. r V

- The device is simple and yet very efiective for the purposes desired. It is espe cially useful where pipe lines, such for instance asirrigating piping, are 50 located that'dirt and sand are likely to accumulate or be blown upon or around the valves or other controlling means employed, for the working parts are all operable within the casing of the gate valve with the exception of the outer end of the valve stem. Since the" said valve stem has "no reciprocating movement, and the outer end or that por- 7 ing 3 1, no difficulty is experienced in operating the valve gate at any desired time.

"It will Le understood of course that the minior details of construction may be varied and the thickness and strength of the parts altered to adapt the gate to various uses and various sizes of piping, all within the spirit and scope of the present invention.

What is claimed is:

1. A gate valve mechanism comprising a casing having opposite ports for the passage of an element therethrough, a pair of disk valves housed in said casing for closing said ports, a rotatable valve stem held against longitudinal movement in said casing, means threaded on said valve stem for raising'and spacing said valves, a spreading element loosely carried by said valve stem fo-r'engagement with and seating said valves,.and telescoping studs on the lower portions of and spacing said valves.

2. A gate valve mechanism comprising a casing having port in oppositesides thereof, apair of disk'valves sup orted op-r,

posite said ports, a valve stem or raising of said valves, a spreading element loosely carried by said valve Stemfhaving a semi spherical end portion engaging'said sockets,

and means for raising said valvesand said] spreading element. n

3. A gate valvemechanlsm. comprising a casing having valve seats formed there-1n, a

lifting screw rotatably held in saidcasing, a

protecting sleeve covering the exposed portion of sald screw for preventlng the corro sion thereof, valves in said-casing engag-' lng said seats, a movable support "on'saldl screw for operating said valves, said valves having sockets formed therein at the center 7 and transversely formed; shoulders at the bottom of said sockets, a spreader carried by said screvv and movable With said valves Copies 01" this patent'may be obtained for five mm each, by addressing the "(l0mn1iss1onerjot intent,

said valves, as set forth,

should'ers' fo-r firmly seating and unseating A gate valve mechanism comprising a v f;-

casing having opposite gvalve ports therein, disk valves,- for opening and closing said p0rts,,a. lifiting screw for raising and lovv-, ering sa d valves, un form spaclngmeansat' thetop and bottomyofsaid valves permitting a, substantial horizontal movement of the valves for v Wedgmg the valves against their seats, and a spreading means carried on: said screw for engagement with; the valvesand capable oflimited vertical movement ,With and by means yof said'valves, as

set forth. a

hand in p'resence of two-Witnesses.

Witnessesz I CAssELL SEvERANoE, EARLE R PoL AnD.

Washington, D. Q.

In' testimony whereof, I have hereunto set-L 0 FRANK -sNoW] 

